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using System;
using System.Collections.Generic;
namespace Jellyfin.Extensions
{
/// <summary>
/// Static extensions for the <see cref="IReadOnlyList{T}"/> interface.
/// </summary>
public static class ReadOnlyListExtension
{
/// <summary>
/// Finds the index of the desired item.
/// </summary>
/// <param name="source">The source list.</param>
/// <param name="value">The value to fine.</param>
/// <typeparam name="T">The type of item to find.</typeparam>
/// <returns>Index if found, else -1.</returns>
public static int IndexOf<T>(this IReadOnlyList<T> source, T value)
{
if (source is IList<T> list)
{
return list.IndexOf(value);
}
for (int i = 0; i < source.Count; i++)
{
if (Equals(value, source[i]))
{
return i;
}
}
return -1;
}
/// <summary>
/// Finds the index of the predicate.
/// </summary>
/// <param name="source">The source list.</param>
/// <param name="match">The value to find.</param>
/// <typeparam name="T">The type of item to find.</typeparam>
/// <returns>Index if found, else -1.</returns>
public static int FindIndex<T>(this IReadOnlyList<T> source, Predicate<T> match)
{
if (source is List<T> list)
{
return list.FindIndex(match);
}
for (int i = 0; i < source.Count; i++)
{
if (match(source[i]))
{
return i;
}
}
return -1;
}
/// <summary>
/// Get the first or default item from a list.
/// </summary>
/// <param name="source">The source list.</param>
/// <typeparam name="T">The type of item.</typeparam>
/// <returns>The first item or default if list is empty.</returns>
public static T? FirstOrDefault<T>(this IReadOnlyList<T>? source)
{
if (source is null || source.Count == 0)
{
return default;
}
return source[0];
}
}
}
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